New PvP Idea

Anyone who has been on Pawncraft in the last 48 hours knows that I love riding things using a saddle. As I was attacking Miralynn with an enderman, I thought: Could this be used in PvP? So I have come up with a new "game" for PvP using mob mounts.

There could be teams or FFA (Free for All)
Each person (or team) decides a mount to use, along with a weapon each.
e.g I could pick:
Mount: Spider
Weapon: Potions of Harming

There could be special rounds, like all ranged weapons.
e.g.
Mount: Skeleton
Weapon: Bow

Tell me if you like this idea, and if you think of anything else, feel free to say so.

EDIT: I just thought of something new.
2 new game modes.
One is to kill the mob, while the other is to kill the rider.

I'd much prefer a plguin that enables us to play capture the wool. I think this idea is good, but it seems very pointless and would seem just like MobArena with a few extras. This game also requires something considered hard to get. A saddle. Where as a capture the flag plugin could be played by everybody.

What I was thinking is that an admin could spawn in mobs + saddles, and when the match finishes, both are taken away again.
I don't know how admin powers work, but I really hope this will be possible.
Also... what is MobArena?

It has been a while since I have been on an animal of some sort with a saddle, but I'm still pretty sure you can kill the animal while you ride it. Also, during one of the modes the player could be killed while you have to kill the animal, and vice versa. During both of those times would the admins have to keep spawning animals/saddles?